Take a story's temperature by studying its tone. Is it hopeful? Cynical? Snarky? Playful?
London’s tone is contemplative – he often steps away from plot to comment on the way Buck is learning, how Buck’s character changes, or what the call of the wild surroundings begins to mean to Buck. These contemplative passages are most striking at certain key events in the story, such as when Buck chases the rabbit in Chapter Three or, of course, at the end, when we see Buck in his new role in the wild. The author is also clearly sympathetic to Buck’s character, rendering him in a genuine and compassionate manner.